var a = 0;
$(window).scroll(function() {

  if($('.mu-single-counter').length){
    var oTop = $('.mu-single-counter').offset().top - window.innerHeight;
    if (a == 0 && $(window).scrollTop() > oTop) {
      $('.counter-value').each(function() {
        var $this = $(this),
            countTo = $this.attr('data-count');
        $({
          countNum: $this.text()
        }).animate({
              countNum: countTo
            },

            {

              duration: 2000,
              easing: 'swing',
              step: function() {
                $this.text(Math.floor(this.countNum));
              },
              complete: function() {
                $this.text(this.countNum);
                //alert('finished');
              }

            });
      });
      a = 1;
    }
  }


});